Doctor Who companions through the ages, from Jacqueline Hill to Karen Gillan and Pearl Mackie

Another perfect foil, this time for the mother hennish tendencies of the Third Doctor, clumsy UNIT operative Jo was insanely loyal to the Doctor, who had to cope with her well-meaning tendencies which didn't almost go to plan. One of the warmest Doctor-companion pairings of the original series, as clearly seen in her leaving scene.